A box of mass m = 51 kg is being pulled by a constant force F = 101 N at an angle q = 15 degrees. (A) If the kinetic friction coefficient was m = 0.19 between the box and the surface, what is the magnitude of the friction force? What is the direction of the friction force? (B) What is the magnitude of the total, or net, force acting on the box?

A 66.1-kg skier coasts up a snow-covered hill that makes an angle of 29.8 ° with the horizontal. The initial speed of the skier is 8.59 m/s. After coasting a distance of 2.13 m up the slope, the speed of the skier is 4.95 m/s. (a) Find the work done by the kinetic frictional force that acts on the skis. (b) What is the magnitude of the kinetic frictional force?

A 2.5 kg mass is initially at rest on a horizontal surface. An applied force acts in the +x direction resulting in a displacement of 1.50 m. If the speed of the mass is 4.00 m/s at the 1.50 m mark, what net work was done?

The force of attraction on an object below Earth’s surface is directly proportional to its distance from Earth’s center. Find the work done in moving a weight of w lb located a mi below Earth’s surface up to the surface itself. Assume Earth’s radius is a constant r mi.

A 40.5 kg box initially at rest is pushed 4.40 m along a rough, horizontal floor with a constant applied horizontal force of 125 N. If the coefficient of friction between box and floor is 0.300, find the following. (d) the work done by the gravitational force J(e) the change in kinetic energy of the box J(f) the final speed of the box m/s

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A cord is used to vertically lower an initially stationary block of mass M = 4.9 kg at a constant downward acceleration of g/7. When the block has fallen a distance d = 2.4 m, find (a) the work done by the cord's force on the block, (b) the work done by the gravitational force on the block, (c) the kinetic energy of the block, and (d) the speed of the block. (Note : Take the downward direction positive) (a) Number Units (b) Number Units (c) Number Units (d) Number Units

A flashlight supported by a single cable descends a down a narrow tunnel and is gradually slowing down. There are only two forces acting on this flashlight (Ft and Fg). Which one of the following statements is true? The work done by the tension force is zero joules. b) The work done by the gravitational force is zero joules. c) The net work done by the two forces is zero joules. d) The magnitude of the work done by the gravitational force is larger than that done by the tension force. e) The magnitude of the work done by the tension force is larger than that done by the gravitational force. ‹

A 68.3-kg skier coasts up a snow-covered hill that makes an angle of 25.5 ° with the horizontal. The initial speed of the skier is 9.77 m/s. After coasting a distance of 1.45 m up the slope, the speed of the skier is 3.60 m/s. (a) Find the work done by the kinetic frictional force that acts on the skis. (b) What is the magnitude of the kinetic frictional force? (a) Number i (b) Number i Units Units 0

A 35 kg sled slides along a horizontal surface on which the coefficient of kinetic friction is 0.25. Its velocity at point A is 10.0 m/s, and its velocity at point B is 2.0 m/s. You must use Work/Energy methods (not Kinematics). (a) What is the frictional force acting on the sled? (b) How much work is done on the sled by friction over the displacement ∆x = xB − xA? (c) What is the distance the sled travels between A and B?